JPS605844A - Sliding contact material - Google Patents

Abstract

PURPOSE:To obtain a sliding contact material having superior wear resistance by adding specified elements to an Au-Pt-Pd-Ag alloy without changing the ratio in the composition. CONSTITUTION:To an alloy material for a sliding contact having a composition consisting of, by weight, 19-21% Au, 4-6% Pt, 44-46% Pd and 29-31% Ag are added 1-10wt% In and 0.5-3wt% at least one among Si, Zr, Bi, Ge and Ga without changing the ratio in the composition. By adding the elements, the hardness of the alloy is increased, so the resistance of the alloy to wear during sliding along a commutator is improved. When 0.01-0.5wt% Fe group metal such as Ni is substituted for part of In, the grains of the alloy are made fine to further improve the wear resistance.

Description

[Detailed description of the invention] The present invention relates to improvements in sliding contact materials.

Conventionally, various materials have been used as tM moving contact materials, and in particular, as materials for brush contacts, A u 19-21
Weight%, Pt4-6% by weight, 1) d44-46% by weight,
Alloy materials consisting of 29-31% Ag have been widely used.

However, brush contacts made of this alloy material have poor abrasion resistance when sliding with the commutator, and tend to generate abrasion powder, which causes noise.

The present invention has been made in order to eliminate such drawbacks, and provides a sliding contact material that uses the above-mentioned alloy material as a base material and has improved wear resistance by adding a small amount of a specific element to the alloy material. That is.

The sliding contact material of the present invention has an Au of 19 to 21% by weight.

Weight 4-6% by weight, Pd 44-46% by weight, Ag 29-
31% by weight of In and 1 to 10% by weight of St, Zr, and Bi without changing the composition ratio.

At least one of Gc and Ga is added in an amount of 0.5 to 3% by weight.

In the sliding contact material of the present invention, A u 19-21j
lj amount%, 1) 14 to 6% by weight, 1) d44 to 46% by weight, and Ag 29 to 31% by weight, without changing the composition ratio, In is added to 1 to 10% by weight. St.
Zr.

The reason why a small amount of 13i, Qa, and Ga (each type is added at 0.5 to 3% by weight) is to harden the alloy material to improve its wear resistance, and when In is less than 1% by weight or BaS
At least one of i, Zr, Bi, Ge, and Ga is 0.5
If the In content is less than 10% by weight, the effect cannot be exhibited, and if the In content exceeds 10% by weight, 3i, Zr.

If the amount of Bi, Ge, or Ga is low (any one of them exceeds 3% by weight), the amount of oxides generated increases, the contact resistance becomes high, and it becomes unstable.

Further, a part of the In is replaced with 0.01 to 0.5% by weight of Fe.
The reason for replacing it with a group metal is to refine the crystal grains and further improve wear resistance.If it is less than 0.01% by weight, the effect of grain refinement will not appear, but if it exceeds 0.5% by weight, the effect of grain refinement will not appear. However, no further effect can be obtained.

Next, using the sliding contact material according to the present invention and the conventional sliding contact material having the compositions shown in the left column below, each wire diameter was 0.7 mm.
Make brush wire, cut each into 8mm length, and make 2
-θ1)) were placed in parallel and welded to a base material with a width of 10 mm, J = 13, and a thickness of 0.2 + nm, and a 2R arc-shaped contact portion was bent at the other end to create a brush contact. . Then, each brush contact was brought into contact with a disk-shaped commutator, and the commutator was rotated in forward and reverse directions to perform a sliding test under the following test conditions, and the wear amount and contact resistance were measured. The results shown in the column are (M).

Test conditions Current: 0.6A Voltage: 12V Load: Resistance load Rotation speed: 'fooor pm Peripheral speed: 130-120 m:/min Contact crab
100g Test time: 7 hours (blank below) As is clear from the table above, the brush contacts of Examples 1 to 6 had significantly less wear than the conventional brush contacts (and the contact resistance was equally low and stable). This is because the sliding contact material of the present invention constituting the brush wire of the brush contacts of Examples 1 to 6 is composed of In, St, ZrJ)3i, G
This is because the addition of at least one of e and Ga increases hardness and improves wear resistance. In particular, the reason why the amount of wear of the brush contact of Example 6 is even smaller than that of the brush contacts of Examples 1 to 5 is that Fe group metal is added to the sliding contact material of the present invention that constitutes the brush line system. This is because the crystal grains are fine and dispersed, which further improves wear resistance.

As detailed above, according to the sliding contact material according to the present invention,
It has significantly superior IT wear resistance compared to conventional sliding contact materials, generates extremely little wear powder, generates almost no noise, and has contact resistance equivalent to that of conventional sliding contact materials. This has the effect of providing a brush contact point.

Applicant Tanaka Kikinzoku Kogyo Co., Ltd.

Claims (1)

[Claims] 1) Au 19-21% by weight, Pt 4-6% by weight
, 1n to 1n to an alloy material consisting of 44 to 46% by weight of Pd and 29 to 31% by weight of Ag without changing the composition ratio.
10% by weight and S j + zr + B s r G e
+ A sliding contact material containing 0.5 to 3% by weight of at least one type of Ga. 2) Part of the jn is 0.01 to 0.5 fffffi
% of the sliding contact material according to claim 1, wherein the sliding contact material is replaced with Fe group metal.